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acinetobacter baumannii

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https://www.readbyqxmd.com/read/28724953/antimicrobial-efficacy-and-synergy-of-metal-ions-against-enterococcus-faecium-klebsiella-pneumoniae-and-acinetobacter-baumannii-in-planktonic-and-biofilm-phenotypes
#1
Misha Y Vaidya, Andrew J McBain, Jonathan A Butler, Craig E Banks, Kathryn A Whitehead
The effects of metal ion solutions (silver, copper, platinum, gold and palladium) were determined individually and in combination against Enterococcus faecium, Acinetobacter baumannii and Klebsiella pneumoniae. Platinum, gold and palladium showed the greatest antimicrobial efficacy in zone of inhibition (ZoI) assays. When tested in combinations using ZoI assays, gold/platinum, gold/palladium and platinum/palladium were indicative of synergy. Microbial inhibitory concentration demonstrated platinum and gold against Enterococcus faecium, platinum against Klebsiella pneumoniae and platinum and silver against Acinetobacter baumannii were optimal...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724383/molecular-characterization-and-genetic-relatedness-of-clinically-acinetobacter-baumanii-isolates-conferring-increased-resistance-to-the-first-and-second-generations-of-tetracyclines-in-iran
#2
Zahra Meshkat, Himen Salimizand, Yousef Amini, Mostafa Khakshoor, Davoud Mansouri, Hadi Farsiani, Kiarash Ghazvini, Adel Najafi
BACKGROUND: The increasing resistance of Acinetobacter baumannii to antibiotics has recently been regarded as a notable therapeutic difficulty. Evaluating resistance rates of some A. baumannii isolates to tetracyclines had an impact on understanding the antibiotic resistance dissemination. By comparing genetic characteristics and relatedness of A. baumannii isolates, we are able to determine the transition dynamics of outbreak isolates. METHODS: A total of 72 non-duplicate isolates of A...
July 19, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28724243/extensively-and-multi-drug-resistant-acinetobacter-baumannii-recovered-from-technosol-at-a-dump-site-in-croatia
#3
Jasna Hrenovic, Goran Durn, Martina Seruga Music, Svjetlana Dekic, Tamara Troskot-Corbic, Dijana Skoric
In a karst pit above City of Rijeka in Croatia the hazardous industrial waste was continuously disposed from 1955 to 1990, and later it was periodically used as an illegal dump site. The surface part of a technosol at the edge of dump was analysed mineralogically, geochemically and bacteriologically. From the technosol rich in petroleum hydrocarbons and heavy metals three isolates of Acinetobacter baumannii were recovered. Isolates from technosol shared many features that are previously described for clinically isolates: the affiliation to IC1 and 2, multi-drug resistant (MDR) or extensively drug-resistant (XDR) antibiotic resistance profile, carbapenem resistance mediated by blaOXA72 and blaOXA23 genes, and the expression of virulence factors...
July 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28721845/combination-of-polymyxin-b-and-meropenem-eradicates-persister-cells-from-acinetobacter-baumannii-strains-in-exponential-growth
#4
Stephanie W Gallo, Carlos Alexandre S Ferreira, Sílvia D de Oliveira
No abstract text is available yet for this article.
July 18, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28717038/a-human-biofilm-disrupting-monoclonal-antibody-potentiates-antibiotic-efficacy-in-rodent-models-of-both-staphylococcus-aureus-and-acinetobacter-baumannii-infections
#5
Yan Q Xiong, Angeles Estellés, L Li, W Abdelhady, R Gonzales, Arnold S Bayer, Edgar Tenorio, Anton Leighton, Stefan Ryser, Lawrence M Kauvar
Many serious bacterial infections are antibiotic-refractory due to biofilm formation. A key structural component of biofilm is extracellular DNA which is stabilized by bacterial proteins, including those from the DNABII family. TRL1068 is a high affinity human monoclonal antibody against a DNABII epitope conserved across both gram-positive and gram-negative bacterial species. In the current study, the efficacy of TRL1068 for disruption of biofilm was demonstrated in vitro in the absence of antibiotics by scanning electron microscopy...
July 17, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28714913/novel-fri1-like-viruses-infecting-acinetobacter-baumannii-vb_abap_as11-and-vb_abap_as12-characterization-comparative-genomic-analysis-and-host-recognition-strategy
#6
Anastasia V Popova, Daria G Lavysh, Evgeniy I Klimuk, Mikhail V Edelstein, Alexander G Bogun, Mikhail M Shneider, Artemiy E Goncharov, Sergey V Leonov, Konstantin V Severinov
Acinetobacter baumannii is a gram-negative, non-fermenting aerobic bacterium which is often associated with hospital-acquired infections and known for its ability to develop resistance to antibiotics, form biofilms, and survive for long periods in hospital environments. In this study, we present two novel viruses, vB_AbaP_AS11 and vB_AbaP_AS12, specifically infecting and lysing distinct multidrug-resistant clinical A. baumannii strains with K19 and K27 capsular polysaccharide structures, respectively. Both phages demonstrate rapid adsorption, short latent periods, and high burst sizes in one-step growth experiments...
July 17, 2017: Viruses
https://www.readbyqxmd.com/read/28714473/prioritizing-multiple-therapeutic-targets-in-parallel-using-automated-dna-encoded-library-screening
#7
Carl A Machutta, Christopher S Kollmann, Kenneth E Lind, Xiaopeng Bai, Pan F Chan, Jianzhong Huang, Lluis Ballell, Svetlana Belyanskaya, Gurdyal S Besra, David Barros-Aguirre, Robert H Bates, Paolo A Centrella, Sandy S Chang, Jing Chai, Anthony E Choudhry, Aaron Coffin, Christopher P Davie, Hongfeng Deng, Jianghe Deng, Yun Ding, Jason W Dodson, David T Fosbenner, Enoch N Gao, Taylor L Graham, Todd L Graybill, Karen Ingraham, Walter P Johnson, Bryan W King, Christopher R Kwiatkowski, Joël Lelièvre, Yue Li, Xiaorong Liu, Quinn Lu, Ruth Lehr, Alfonso Mendoza-Losana, John Martin, Lynn McCloskey, Patti McCormick, Heather P O'Keefe, Thomas O'Keeffe, Christina Pao, Christopher B Phelps, Hongwei Qi, Keith Rafferty, Genaro S Scavello, Matt S Steiginga, Flora S Sundersingh, Sharon M Sweitzer, Lawrence M Szewczuk, Amy Taylor, May Fern Toh, Juan Wang, Minghui Wang, Devan J Wilkins, Bing Xia, Gang Yao, Jean Zhang, Jingye Zhou, Christine P Donahue, Jeffrey A Messer, David Holmes, Christopher C Arico-Muendel, Andrew J Pope, Jeffrey W Gross, Ghotas Evindar
The identification and prioritization of chemically tractable therapeutic targets is a significant challenge in the discovery of new medicines. We have developed a novel method that rapidly screens multiple proteins in parallel using DNA-encoded library technology (ELT). Initial efforts were focused on the efficient discovery of antibacterial leads against 119 targets from Acinetobacter baumannii and Staphylococcus aureus. The success of this effort led to the hypothesis that the relative number of ELT binders alone could be used to assess the ligandability of large sets of proteins...
July 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28714256/a1s_2811-a-chea-y-like-hybrid-two-component-regulator-from-acinetobacter%C3%A2-baumannii-atcc17978-is-involved-in-surface-motility-and-biofilm-formation-in-this-bacterium
#8
Rong Chen, Ruichen Lv, Lisheng Xiao, Min Wang, Zongmin Du, Yafang Tan, Yujun Cui, Yanfeng Yan, Yanping Luo, Ruifu Yang, Yajun Song
Two-component systems in Acinetobacter baumannii are associated with its virulence, drug resistance, motility, biofilm formation, and other characteristics. In this study, we used RecAb , a genetic engineering method, to investigate the function of A1S_2811 in A. baumannii strain ATCC17978. A1S_2811, a hypothetical hybrid sensor histidine kinase/response regulator, has four histidine-containing phosphotransfer domains, a CheA-like regulatory domain, and a CheY-like receiver domain at its C terminus. Compared with the ATCC17978 strain, both surface motility and biofilm formation at the gas-liquid interface decreased significantly in the A1S_2811 knock-out strain...
July 17, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28711441/emergence-of-carbapenem-resistant-acinetobacter-baumannii-st787-in-clinical-isolates-from-blood-in-a-tertiary-teaching-hospital-in-northern-taiwan
#9
Yi-Fan Hu, Charles Jia-Yin Hou, Chien-Feng Kuo, Nai-Yu Wang, Alice Ying-Jung Wu, Ching-Hsiang Leung, Chang-Pan Liu, Hung-I Yeh
BACKGROUND/PURPOSE: The purpose of this study is to investigate the predominant clones of carbapenem-resistant Acinetobacter baumannii (CRAB) in our hospital in Taiwan by pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) technique. METHODS: We collected 108 non-duplicate A. baumannii clinical blood isolates from January 2012 to December 2013 in MacKay Memorial Hospital. PFGE and MLST were used for typing the A. baumannii isolates and for investigation of the predominant clones...
June 22, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28710611/bad-bacteria-in-acute-appendicitis-rare-but-relevant
#10
Alexander Reinisch, Patrizia Malkomes, Nils Habbe, Wolf Otto Bechstein, Juliane Liese
PURPOSE: Bacterial infections are a factor for morbidity in patients with acute appendicitis (AA). The spreading of multidrug-resistant (MDR) bacteria is a significant problem in surgery, and the most relevant MDR pathogens are summarized as Enterobacteriaceae, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterococci (ESKAPE) bacteria. Data regarding the species and distribution of bacteria in AA are available, but information about the resistances and their relevance is deficient...
July 15, 2017: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/28705768/the-clinical-and-microbiological-characteristics-of-infections-in-burn-patients-from-the-formosa-fun-coast-dust-explosion
#11
Tzu-Chao Lin, Rui-Xin Wu, Chih-Chien Chiu, Ya-Sung Yang, Yi Lee, Jung-Chung Lin, Feng-Yee Chang
BACKGROUND/PURPOSE: Bloodstream infection is a leading cause of mortality among burn patients. This study aimed to evaluate the risk factors, causative pathogens, and the relationship between bloodstream infections and other infections among burn patients from the Formosa Fun Coast Dust Explosion. METHODS: This retrospective study evaluated the demographic and clinical characteristics, infection types, causative pathogen(s), and isolates' antibiotic susceptibilities from patients who were hospitalized between June 27 and September 31, 2015...
June 22, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28705755/isolation-and-whole-genome-sequence-analysis-of-the-imipenem-heteroresistant-acinetobacter-baumannii-clinical-isolate-hrab-85
#12
Puyuan Li, Yong Huang, Lan Yu, Yannan Liu, Wenkai Niu, Dayang Zou, Huiying Liu, Jing Zheng, Xiuyun Yin, Jing Yuan, Xin Yuan, Changqing Bai
OBJECTIVES: Heteroresistance is a phenomenon in which there are various responses to antibiotics from bacterial cells within the same population. Here, we isolated and characterised an imipenem heteroresistant Acinetobacter baumannii strain (HRAB-85). METHODS: The genome of strain HRAB-85 was completely sequenced and analysed to understand its antibiotic resistance mechanisms. POPULATION: analysis and multilocus sequence typing were performed...
July 10, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28705748/effect-of-secondary-metabolite-of-actinidia-deliciosa-on-the-biofilm-and-extra-cellular-matrix-components-of-acinetobacter-baumannii
#13
Vishvanath Tiwari, Deepika Tiwari, Varsha Patel, Monalisa Tiwari
Acinetobacter baumannii, opportunistic nosocomial pathogen, increases gradually in the clinical setup. The high level of resistance mechanisms acquired by these bacteria makes their eradication difficult and biofilm formation is one of them. Biofilm comprises of closely packed bacterial population crowded together by extra-cellular matrix (ECM). ECM contains bacterial secreted polymers such as exopolysaccharides (EPS), proteins and extracellular-DNA (e-DNA) and rarely amyloidogenic proteins. Biofilm offers protection of underlying bacterial population against chemotherapeutic agents and host immune system...
July 11, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28705678/pharmacodynamics-of-minocycline-against-acinetobacter-baumannii-studied-in-a-pharmacokinetic-model-of-infection
#14
Wadha A Alfouzan, A R Noel, Karen E Bowker, Mlg Attwood, S G Tomaselli, Alasdair P MacGowan
OBJECTIVES: Minocycline (MIN) is an old antibiotic which may have an important role in the treatment of multidrug Gram-negative infection as the burden of such infectious increase. METHODS: We used a single compartment dilutional pharmacokinetic model to determine the relationship between MIN exposure and antibacterial effect, including risk of emergence of resistance against strains of Acinetobacter baumannii. RESULTS: The unbound drug area-under-the-curve to MIC ratio (fAUC/MIC) associated with a 24h bacteriostatic effect was 16...
July 10, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28705668/in-vitro-activity-of-the-novel-fluorocycline-eravacycline-against-carbapenem-non-susceptible-acinetobacter-baumannii
#15
Harald Seifert, Danuta Stefanik, Joyce A Sutcliffe, Paul G Higgins
The activity of eravacycline was compared with anti-Acinetobacter reference antimicrobials against carbapenem non-susceptible Acinetobacter baumannii isolates associated with an acquired OXA or up-regulation of the intrinsic OXA-51-like enzyme. Antimicrobial susceptibility testing was performed by broth microdilution of 286 non-duplicate, carbapenem non-susceptible A. baumannii isolates to eravacycline, amikacin colistin, doxycycline, imipenem, levofloxacin, meropenem, minocycline, sulbactam, tigecycline, and tobramycin...
July 10, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28705499/development-of-silver-nanoparticles-loaded-chitosan-alginate-constructs-with-biomedical-potentialities
#16
Muhammad Bilal, Tahir Rasheed, Hafiz M N Iqbal, Chuanlong Li, Hongbo Hu, Xuehong Zhang
Herein, a facile biosynthesis of silver nanoparticles (AgNPs) and AgNPs-loaded chitosan-alginate constructs with biomedical potentialities is reported. The UV-vis spectroscopic profile confirmed the synthesis of AgNPs using methanolic leaves extract of Euphorbia helioscopia. The newly developed AgNPs were characterized using various analytical and imaging techniques including UV-vis and FT-IR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), atomic force microscopy (AFM), and transmission electron microscopy (TEM)...
July 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28705201/genotypic-diversity-among-multidrug-resistant-pseudomonas-aeruginosa-and-acinetobacter-species-at-mulago-hospital-in-kampala-uganda
#17
David P Kateete, Ritah Nakanjako, Moses Okee, Moses L Joloba, Christine F Najjuka
BACKGROUND: Multidrug resistant Pseudomonas aeruginosa and Acinetobacter species are common causes of nosocomial infections worldwide. Recently we reported the occurrence of carbapenem resistant Enterobacteriaceae, P. aeruginosa and Acinetobacter species at Mulago National Referral Hospital in Kampala, Uganda, but the isolates were not analyzed for genetic relatedness. Herein we report the intra-species genotypic diversity among P. aeruginosa and Acinetobacter baumannii isolated from hospitalized patients and the environment at Mulago Hospital, using repetitive elements-based PCR (Rep-PCR) genotyping...
July 14, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28701421/carbapenemase-detection-amongst-carbapenem-resistant-glucose-nonfermenting-gram-negative-bacilli
#18
Patricia J Simner, Belita N A Opene, Krizia K Chambers, Matthew E Naumann, Karen C Carroll, Pranita D Tamma
Background: Accurate detection of carbapenemase-producing glucose nonfermenting gram-negative bacilli (CPNF), including Pseudomonas aeruginosa and Acinetobacter baumannii, is necessary to prevent their dissemination within health care settings. We performed a methods comparison study of 11 phenotypic carbapenemase-detection assays to evaluate their accuracy for the detection of CPNFs.Methods: 96 carbapenem-resistant glucose nonfermenting isolates were included, of which 29% produced carbapenemases. All CPNFs were molecularly characterized to identify β-lactamase genes...
July 12, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28701266/community-acquired-bloodstream-infections-caused-by-acinetobacter-baumannii-a%C3%A2-matched-case-control-study
#19
Chung-Ting Chen, Yung-Chih Wang, Shu-Chen Kuo, Fang-Huy Shih, Te-Li Chen, Chorng-Kuang How, Ya-Sung Yang, Yi-Tzu Lee
BACKGROUND: Acinetobacter baumannii is an important nosocomial pathogen worldwide. Its role in community-acquired infection remains controversial and has rarely been reported. METHODS: Patients with monobacterial bloodstream infections caused by genomic species identified A. baumannii, admitted to Taipei Veterans General Hospital between 1999 and 2010, were selected as cases. Controls were defined as patients acquiring infection in a healthcare setting and were matched for age and sex...
June 29, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28701170/antimicrobial-susceptibility-among-gram-positive-and-gram-negative-organisms-collected-from-the-latin-american-region-between-2004-and-2015-as-part-of-the-tigecycline-evaluation-and-surveillance-trial
#20
Silvio Vega, Michael J Dowzicky
BACKGROUND: The in vitro activity of tigecycline and comparator agents was evaluated against Gram-positive and Gram-negative isolates collected in Latin American centers between 2004 and 2015 as part of the Tigecycline Evaluation and Surveillance Trial (T.E.S.T.) global surveillance study. METHODS: Minimum inhibitory concentrations (MICs) were determined using the broth microdilution methodology according to the Clinical and Laboratory Standards Institute (CLSI) guidelines...
July 12, 2017: Annals of Clinical Microbiology and Antimicrobials
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